Computer graphics processing and selective visual display system – Plural display systems – Tiling or modular adjacent displays
Patent
1992-09-30
1994-04-26
Hjerpe, Richard
Computer graphics processing and selective visual display system
Plural display systems
Tiling or modular adjacent displays
345 20, 345147, G09G 100
Patent
active
053070836
ABSTRACT:
A multi-shade video conversion system is described to provide an enhanced "Macintosh SE/30" computer to display multi-shade images on the "SE/30" internal CRT. The conventional "SE/30" computer has a microprocessor motherboard, an expansion slot, and an internal CRT. An internal CRT amplifier apart from the motherboard normally receives and responds a binary video signal from the microprocessor motherboard to drive the internal CRT. The conversion system comprises a video frame buffer expansion board, a replacement analog CRT amplifier, and replacement cabling. The frame buffer expansion board generates an analog video signal which is selected provided to the replacement CRT amplifier, allowing multi-shade images to be displayed in the internal CRT. The frame buffer expansion board also has an auxiliary video output port to drive an external CRT. The replacement cabling supplies the motherboard binary video signal to the expansion board rather than to the replacement CRT amplifier. A primary video switch on the frame buffer expansion board provides the analog signal to the external CRT and the binary video signal to the internal CRT if the auxiliary CRT is connected to the auxiliary video output port. It provides the analog video signal to internal CRT if the auxiliary CRT is not connected to the auxiliary video output port. The frame buffer expansion board includes means for automatically sensing whether the external CRT is connected.
REFERENCES:
patent: 4673929 (1987-06-01), Nelson et al.
patent: 4684935 (1987-08-01), Fujisaku et al.
patent: 4704697 (1987-11-01), Kiremidjian et al.
patent: 5083121 (1992-01-01), Nomura et al.
Silicon Valley Personal Computer Design Conference, Conference Proceedings, "A Versatile, Low-Cost Bus Interface and Video Timing ASIC", by Snodgrass et al., Jul. 9-10, 1991.
Product Brochure entitled "Xceed MacroColor II, Xceed Macintosh Enhancement Products", by Micron Technology, Inc. (Jul. 15, 1991).
Blodgett Greg
Snodgrass Chuck
Stamm Tom
Hjerpe Richard
Micro)n Technology, Inc.
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